Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-16 02:14:58 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

ext4: avoid ptr null pointer dereference

Browse Source 
When commit 13df4d44a3aa ("ext4: fix slab-out-of-bounds in
ext4_mb_find_good_group_avg_frag_lists()") was backported to stable, the
commit f536808adcc3 ("ext4: refactor out ext4_generic_attr_store()") that
uniformly determines if the ptr is null is not merged in, so it needs to
be judged whether ptr is null or not in each case of the switch, otherwise
null pointer dereferencing may occur.

Fixes: b829687ae122 ("ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()")
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baokun Li 2024-07-16 17:29:29 +08:00 committed by Greg Kroah-Hartman
parent d4b66460b1
commit 7fe6e3132d
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ext4/sysfs.c
View File

@ -473,6 +473,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
*((unsigned int *) ptr) = t;
return len;
case attr_clusters_in_group:
if (!ptr)
return 0;
ret = kstrtouint(skip_spaces(buf), 0, &t);
if (ret)
return ret;